git.oblomov.eu Git - linux-2.6/blob - arch/sparc64/kernel/ptrace.c

   1 /* ptrace.c: Sparc process tracing support.
   2  *
   3  * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  *
   6  * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
   7  * and David Mosberger.
   8  *
   9  * Added Linux support -miguel (weird, eh?, the original code was meant
  10  * to emulate SunOS).
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/sched.h>
  15 #include <linux/mm.h>
  16 #include <linux/errno.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/user.h>
  19 #include <linux/smp.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/security.h>
  22 #include <linux/seccomp.h>
  23 #include <linux/audit.h>
  24 #include <linux/signal.h>
  25 #include <linux/regset.h>
  26 #include <linux/compat.h>
  27 #include <linux/elf.h>
  28
  29 #include <asm/asi.h>
  30 #include <asm/pgtable.h>
  31 #include <asm/system.h>
  32 #include <asm/uaccess.h>
  33 #include <asm/psrcompat.h>
  34 #include <asm/visasm.h>
  35 #include <asm/spitfire.h>
  36 #include <asm/page.h>
  37 #include <asm/cpudata.h>
  38
  39 /* #define ALLOW_INIT_TRACING */
  40
  41 /*
  42  * Called by kernel/ptrace.c when detaching..
  43  *
  44  * Make sure single step bits etc are not set.
  45  */
  46 void ptrace_disable(struct task_struct *child)
  47 {
  48         /* nothing to do */
  49 }
  50
  51 /* To get the necessary page struct, access_process_vm() first calls
  52  * get_user_pages().  This has done a flush_dcache_page() on the
  53  * accessed page.  Then our caller (copy_{to,from}_user_page()) did
  54  * to memcpy to read/write the data from that page.
  55  *
  56  * Now, the only thing we have to do is:
  57  * 1) flush the D-cache if it's possible than an illegal alias
  58  *    has been created
  59  * 2) flush the I-cache if this is pre-cheetah and we did a write
  60  */
  61 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
  62                          unsigned long uaddr, void *kaddr,
  63                          unsigned long len, int write)
  64 {
  65         BUG_ON(len > PAGE_SIZE);
  66
  67         if (tlb_type == hypervisor)
  68                 return;
  69
  70 #ifdef DCACHE_ALIASING_POSSIBLE
  71         /* If bit 13 of the kernel address we used to access the
  72          * user page is the same as the virtual address that page
  73          * is mapped to in the user's address space, we can skip the
  74          * D-cache flush.
  75          */
  76         if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
  77                 unsigned long start = __pa(kaddr);
  78                 unsigned long end = start + len;
  79                 unsigned long dcache_line_size;
  80
  81                 dcache_line_size = local_cpu_data().dcache_line_size;
  82
  83                 if (tlb_type == spitfire) {
  84                         for (; start < end; start += dcache_line_size)
  85                                 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
  86                 } else {
  87                         start &= ~(dcache_line_size - 1);
  88                         for (; start < end; start += dcache_line_size)
  89                                 __asm__ __volatile__(
  90                                         "stxa %%g0, [%0] %1\n\t"
  91                                         "membar #Sync"
  92                                         : /* no outputs */
  93                                         : "r" (start),
  94                                         "i" (ASI_DCACHE_INVALIDATE));
  95                 }
  96         }
  97 #endif
  98         if (write && tlb_type == spitfire) {
  99                 unsigned long start = (unsigned long) kaddr;
 100                 unsigned long end = start + len;
 101                 unsigned long icache_line_size;
 102
 103                 icache_line_size = local_cpu_data().icache_line_size;
 104
 105                 for (; start < end; start += icache_line_size)
 106                         flushi(start);
 107         }
 108 }
 109
 110 enum sparc_regset {
 111         REGSET_GENERAL,
 112         REGSET_FP,
 113 };
 114
 115 static int genregs64_get(struct task_struct *target,
 116                          const struct user_regset *regset,
 117                          unsigned int pos, unsigned int count,
 118                          void *kbuf, void __user *ubuf)
 119 {
 120         const struct pt_regs *regs = task_pt_regs(target);
 121         int ret;
 122
 123         if (target == current)
 124                 flushw_user();
 125
 126         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 127                                   regs->u_regs,
 128                                   0, 16 * sizeof(u64));
 129         if (!ret) {
 130                 unsigned long __user *reg_window = (unsigned long __user *)
 131                         (regs->u_regs[UREG_I6] + STACK_BIAS);
 132                 unsigned long window[16];
 133
 134                 if (copy_from_user(window, reg_window, sizeof(window)))
 135                         return -EFAULT;
 136
 137                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 138                                           window,
 139                                           16 * sizeof(u64),
 140                                           32 * sizeof(u64));
 141         }
 142
 143         if (!ret) {
 144                 /* TSTATE, TPC, TNPC */
 145                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 146                                           &regs->tstate,
 147                                           32 * sizeof(u64),
 148                                           35 * sizeof(u64));
 149         }
 150
 151         if (!ret) {
 152                 unsigned long y = regs->y;
 153
 154                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 155                                           &y,
 156                                           35 * sizeof(u64),
 157                                           36 * sizeof(u64));
 158         }
 159
 160         if (!ret)
 161                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 162                                                36 * sizeof(u64), -1);
 163
 164         return ret;
 165 }
 166
 167 static int genregs64_set(struct task_struct *target,
 168                          const struct user_regset *regset,
 169                          unsigned int pos, unsigned int count,
 170                          const void *kbuf, const void __user *ubuf)
 171 {
 172         struct pt_regs *regs = task_pt_regs(target);
 173         int ret;
 174
 175         if (target == current)
 176                 flushw_user();
 177
 178         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 179                                  regs->u_regs,
 180                                  0, 16 * sizeof(u64));
 181         if (!ret && count > 0) {
 182                 unsigned long __user *reg_window = (unsigned long __user *)
 183                         (regs->u_regs[UREG_I6] + STACK_BIAS);
 184                 unsigned long window[16];
 185
 186                 if (copy_from_user(window, reg_window, sizeof(window)))
 187                         return -EFAULT;
 188
 189                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 190                                          window,
 191                                          16 * sizeof(u64),
 192                                          32 * sizeof(u64));
 193                 if (!ret &&
 194                     copy_to_user(reg_window, window, sizeof(window)))
 195                         return -EFAULT;
 196         }
 197
 198         if (!ret && count > 0) {
 199                 unsigned long tstate;
 200
 201                 /* TSTATE */
 202                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 203                                          &tstate,
 204                                          32 * sizeof(u64),
 205                                          33 * sizeof(u64));
 206                 if (!ret) {
 207                         /* Only the condition codes can be modified
 208                          * in the %tstate register.
 209                          */
 210                         tstate &= (TSTATE_ICC | TSTATE_XCC);
 211                         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 212                         regs->tstate |= tstate;
 213                 }
 214         }
 215
 216         if (!ret) {
 217                 /* TPC, TNPC */
 218                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 219                                          &regs->tpc,
 220                                          33 * sizeof(u64),
 221                                          35 * sizeof(u64));
 222         }
 223
 224         if (!ret) {
 225                 unsigned long y;
 226
 227                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 228                                          &y,
 229                                          35 * sizeof(u64),
 230                                          36 * sizeof(u64));
 231                 if (!ret)
 232                         regs->y = y;
 233         }
 234
 235         if (!ret)
 236                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 237                                                 36 * sizeof(u64), -1);
 238
 239         return ret;
 240 }
 241
 242 static int fpregs64_get(struct task_struct *target,
 243                         const struct user_regset *regset,
 244                         unsigned int pos, unsigned int count,
 245                         void *kbuf, void __user *ubuf)
 246 {
 247         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 248         unsigned long fprs, fsr, gsr;
 249         int ret;
 250
 251         if (target == current)
 252                 save_and_clear_fpu();
 253
 254         fprs = task_thread_info(target)->fpsaved[0];
 255
 256         if (fprs & FPRS_DL)
 257                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 258                                           fpregs,
 259                                           0, 16 * sizeof(u64));
 260         else
 261                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 262                                                0,
 263                                                16 * sizeof(u64));
 264
 265         if (!ret) {
 266                 if (fprs & FPRS_DU)
 267                         ret = user_regset_copyout(&pos, &count,
 268                                                   &kbuf, &ubuf,
 269                                                   fpregs + 16,
 270                                                   16 * sizeof(u64),
 271                                                   32 * sizeof(u64));
 272                 else
 273                         ret = user_regset_copyout_zero(&pos, &count,
 274                                                        &kbuf, &ubuf,
 275                                                        16 * sizeof(u64),
 276                                                        32 * sizeof(u64));
 277         }
 278
 279         if (fprs & FPRS_FEF) {
 280                 fsr = task_thread_info(target)->xfsr[0];
 281                 gsr = task_thread_info(target)->gsr[0];
 282         } else {
 283                 fsr = gsr = 0;
 284         }
 285
 286         if (!ret)
 287                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 288                                           &fsr,
 289                                           32 * sizeof(u64),
 290                                           33 * sizeof(u64));
 291         if (!ret)
 292                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 293                                           &gsr,
 294                                           33 * sizeof(u64),
 295                                           34 * sizeof(u64));
 296         if (!ret)
 297                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 298                                           &fprs,
 299                                           34 * sizeof(u64),
 300                                           35 * sizeof(u64));
 301
 302         if (!ret)
 303                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 304                                                35 * sizeof(u64), -1);
 305
 306         return ret;
 307 }
 308
 309 static int fpregs64_set(struct task_struct *target,
 310                         const struct user_regset *regset,
 311                         unsigned int pos, unsigned int count,
 312                         const void *kbuf, const void __user *ubuf)
 313 {
 314         unsigned long *fpregs = task_thread_info(target)->fpregs;
 315         unsigned long fprs;
 316         int ret;
 317
 318         if (target == current)
 319                 save_and_clear_fpu();
 320
 321         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 322                                  fpregs,
 323                                  0, 32 * sizeof(u64));
 324         if (!ret)
 325                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 326                                          task_thread_info(target)->xfsr,
 327                                          32 * sizeof(u64),
 328                                          33 * sizeof(u64));
 329         if (!ret)
 330                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 331                                          task_thread_info(target)->gsr,
 332                                          33 * sizeof(u64),
 333                                          34 * sizeof(u64));
 334
 335         fprs = task_thread_info(target)->fpsaved[0];
 336         if (!ret && count > 0) {
 337                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 338                                          &fprs,
 339                                          34 * sizeof(u64),
 340                                          35 * sizeof(u64));
 341         }
 342
 343         fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 344         task_thread_info(target)->fpsaved[0] = fprs;
 345
 346         if (!ret)
 347                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 348                                                 35 * sizeof(u64), -1);
 349         return ret;
 350 }
 351
 352 static const struct user_regset sparc64_regsets[] = {
 353         /* Format is:
 354          *      G0 --> G7
 355          *      O0 --> O7
 356          *      L0 --> L7
 357          *      I0 --> I7
 358          *      TSTATE, TPC, TNPC, Y
 359          */
 360         [REGSET_GENERAL] = {
 361                 .core_note_type = NT_PRSTATUS,
 362                 .n = 36 * sizeof(u64),
 363                 .size = sizeof(u64), .align = sizeof(u64),
 364                 .get = genregs64_get, .set = genregs64_set
 365         },
 366         /* Format is:
 367          *      F0 --> F63
 368          *      FSR
 369          *      GSR
 370          *      FPRS
 371          */
 372         [REGSET_FP] = {
 373                 .core_note_type = NT_PRFPREG,
 374                 .n = 35 * sizeof(u64),
 375                 .size = sizeof(u64), .align = sizeof(u64),
 376                 .get = fpregs64_get, .set = fpregs64_set
 377         },
 378 };
 379
 380 static const struct user_regset_view user_sparc64_view = {
 381         .name = "sparc64", .e_machine = EM_SPARCV9,
 382         .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
 383 };
 384
 385 static int genregs32_get(struct task_struct *target,
 386                          const struct user_regset *regset,
 387                          unsigned int pos, unsigned int count,
 388                          void *kbuf, void __user *ubuf)
 389 {
 390         const struct pt_regs *regs = task_pt_regs(target);
 391         compat_ulong_t __user *reg_window;
 392         compat_ulong_t *k = kbuf;
 393         compat_ulong_t __user *u = ubuf;
 394         compat_ulong_t reg;
 395
 396         if (target == current)
 397                 flushw_user();
 398
 399         pos /= sizeof(reg);
 400         count /= sizeof(reg);
 401
 402         if (kbuf) {
 403                 for (; count > 0 && pos < 16; count--)
 404                         *k++ = regs->u_regs[pos++];
 405
 406                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 407                 for (; count > 0 && pos < 32; count--) {
 408                         if (get_user(*k++, &reg_window[pos++]))
 409                                 return -EFAULT;
 410                 }
 411         } else {
 412                 for (; count > 0 && pos < 16; count--) {
 413                         if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
 414                                 return -EFAULT;
 415                 }
 416
 417                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 418                 for (; count > 0 && pos < 32; count--) {
 419                         if (get_user(reg, &reg_window[pos++]) ||
 420                             put_user(reg, u++))
 421                                 return -EFAULT;
 422                 }
 423         }
 424         while (count > 0) {
 425                 switch (pos) {
 426                 case 32: /* PSR */
 427                         reg = tstate_to_psr(regs->tstate);
 428                         break;
 429                 case 33: /* PC */
 430                         reg = regs->tpc;
 431                         break;
 432                 case 34: /* NPC */
 433                         reg = regs->tnpc;
 434                         break;
 435                 case 35: /* Y */
 436                         reg = regs->y;
 437                         break;
 438                 case 36: /* WIM */
 439                 case 37: /* TBR */
 440                         reg = 0;
 441                         break;
 442                 default:
 443                         goto finish;
 444                 }
 445
 446                 if (kbuf)
 447                         *k++ = reg;
 448                 else if (put_user(reg, u++))
 449                         return -EFAULT;
 450                 pos++;
 451                 count--;
 452         }
 453 finish:
 454         pos *= sizeof(reg);
 455         count *= sizeof(reg);
 456
 457         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 458                                         38 * sizeof(reg), -1);
 459 }
 460
 461 static int genregs32_set(struct task_struct *target,
 462                          const struct user_regset *regset,
 463                          unsigned int pos, unsigned int count,
 464                          const void *kbuf, const void __user *ubuf)
 465 {
 466         struct pt_regs *regs = task_pt_regs(target);
 467         compat_ulong_t __user *reg_window;
 468         const compat_ulong_t *k = kbuf;
 469         const compat_ulong_t __user *u = ubuf;
 470         compat_ulong_t reg;
 471
 472         if (target == current)
 473                 flushw_user();
 474
 475         pos /= sizeof(reg);
 476         count /= sizeof(reg);
 477
 478         if (kbuf) {
 479                 for (; count > 0 && pos < 16; count--)
 480                         regs->u_regs[pos++] = *k++;
 481
 482                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 483                 for (; count > 0 && pos < 32; count--) {
 484                         if (put_user(*k++, &reg_window[pos++]))
 485                                 return -EFAULT;
 486                 }
 487         } else {
 488                 for (; count > 0 && pos < 16; count--) {
 489                         if (get_user(reg, u++))
 490                                 return -EFAULT;
 491                         regs->u_regs[pos++] = reg;
 492                 }
 493
 494                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 495                 for (; count > 0 && pos < 32; count--) {
 496                         if (get_user(reg, u++) ||
 497                             put_user(reg, &reg_window[pos++]))
 498                                 return -EFAULT;
 499                 }
 500         }
 501         while (count > 0) {
 502                 unsigned long tstate;
 503
 504                 if (kbuf)
 505                         reg = *k++;
 506                 else if (get_user(reg, u++))
 507                         return -EFAULT;
 508
 509                 switch (pos) {
 510                 case 32: /* PSR */
 511                         tstate = regs->tstate;
 512                         tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 513                         tstate |= psr_to_tstate_icc(reg);
 514                         regs->tstate = tstate;
 515                         break;
 516                 case 33: /* PC */
 517                         regs->tpc = reg;
 518                         break;
 519                 case 34: /* NPC */
 520                         regs->tnpc = reg;
 521                         break;
 522                 case 35: /* Y */
 523                         regs->y = reg;
 524                         break;
 525                 case 36: /* WIM */
 526                 case 37: /* TBR */
 527                         break;
 528                 default:
 529                         goto finish;
 530                 }
 531
 532                 pos++;
 533                 count--;
 534         }
 535 finish:
 536         pos *= sizeof(reg);
 537         count *= sizeof(reg);
 538
 539         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 540                                          38 * sizeof(reg), -1);
 541 }
 542
 543 static int fpregs32_get(struct task_struct *target,
 544                         const struct user_regset *regset,
 545                         unsigned int pos, unsigned int count,
 546                         void *kbuf, void __user *ubuf)
 547 {
 548         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 549         compat_ulong_t enabled;
 550         unsigned long fprs;
 551         compat_ulong_t fsr;
 552         int ret = 0;
 553
 554         if (target == current)
 555                 save_and_clear_fpu();
 556
 557         fprs = task_thread_info(target)->fpsaved[0];
 558         if (fprs & FPRS_FEF) {
 559                 fsr = task_thread_info(target)->xfsr[0];
 560                 enabled = 1;
 561         } else {
 562                 fsr = 0;
 563                 enabled = 0;
 564         }
 565
 566         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 567                                   fpregs,
 568                                   0, 32 * sizeof(u32));
 569
 570         if (!ret)
 571                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 572                                                32 * sizeof(u32),
 573                                                33 * sizeof(u32));
 574         if (!ret)
 575                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 576                                           &fsr,
 577                                           33 * sizeof(u32),
 578                                           34 * sizeof(u32));
 579
 580         if (!ret) {
 581                 compat_ulong_t val;
 582
 583                 val = (enabled << 8) | (8 << 16);
 584                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 585                                           &val,
 586                                           34 * sizeof(u32),
 587                                           35 * sizeof(u32));
 588         }
 589
 590         if (!ret)
 591                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 592                                                35 * sizeof(u32), -1);
 593
 594         return ret;
 595 }
 596
 597 static int fpregs32_set(struct task_struct *target,
 598                         const struct user_regset *regset,
 599                         unsigned int pos, unsigned int count,
 600                         const void *kbuf, const void __user *ubuf)
 601 {
 602         unsigned long *fpregs = task_thread_info(target)->fpregs;
 603         unsigned long fprs;
 604         int ret;
 605
 606         if (target == current)
 607                 save_and_clear_fpu();
 608
 609         fprs = task_thread_info(target)->fpsaved[0];
 610
 611         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 612                                  fpregs,
 613                                  0, 32 * sizeof(u32));
 614         if (!ret)
 615                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 616                                           32 * sizeof(u32),
 617                                           33 * sizeof(u32));
 618         if (!ret && count > 0) {
 619                 compat_ulong_t fsr;
 620                 unsigned long val;
 621
 622                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 623                                          &fsr,
 624                                          33 * sizeof(u32),
 625                                          34 * sizeof(u32));
 626                 if (!ret) {
 627                         val = task_thread_info(target)->xfsr[0];
 628                         val &= 0xffffffff00000000UL;
 629                         val |= fsr;
 630                         task_thread_info(target)->xfsr[0] = val;
 631                 }
 632         }
 633
 634         fprs |= (FPRS_FEF | FPRS_DL);
 635         task_thread_info(target)->fpsaved[0] = fprs;
 636
 637         if (!ret)
 638                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 639                                                 34 * sizeof(u32), -1);
 640         return ret;
 641 }
 642
 643 static const struct user_regset sparc32_regsets[] = {
 644         /* Format is:
 645          *      G0 --> G7
 646          *      O0 --> O7
 647          *      L0 --> L7
 648          *      I0 --> I7
 649          *      PSR, PC, nPC, Y, WIM, TBR
 650          */
 651         [REGSET_GENERAL] = {
 652                 .core_note_type = NT_PRSTATUS,
 653                 .n = 38 * sizeof(u32),
 654                 .size = sizeof(u32), .align = sizeof(u32),
 655                 .get = genregs32_get, .set = genregs32_set
 656         },
 657         /* Format is:
 658          *      F0 --> F31
 659          *      empty 32-bit word
 660          *      FSR (32--bit word)
 661          *      FPU QUEUE COUNT (8-bit char)
 662          *      FPU QUEUE ENTRYSIZE (8-bit char)
 663          *      FPU ENABLED (8-bit char)
 664          *      empty 8-bit char
 665          *      FPU QUEUE (64 32-bit ints)
 666          */
 667         [REGSET_FP] = {
 668                 .core_note_type = NT_PRFPREG,
 669                 .n = 99 * sizeof(u32),
 670                 .size = sizeof(u32), .align = sizeof(u32),
 671                 .get = fpregs32_get, .set = fpregs32_set
 672         },
 673 };
 674
 675 static const struct user_regset_view user_sparc32_view = {
 676         .name = "sparc", .e_machine = EM_SPARC,
 677         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 678 };
 679
 680 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 681 {
 682         if (test_tsk_thread_flag(task, TIF_32BIT))
 683                 return &user_sparc32_view;
 684         return &user_sparc64_view;
 685 }
 686
 687 struct compat_fps {
 688         unsigned int regs[32];
 689         unsigned int fsr;
 690         unsigned int flags;
 691         unsigned int extra;
 692         unsigned int fpqd;
 693         struct compat_fq {
 694                 unsigned int insnaddr;
 695                 unsigned int insn;
 696         } fpq[16];
 697 };
 698
 699 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 700                         compat_ulong_t caddr, compat_ulong_t cdata)
 701 {
 702         const struct user_regset_view *view = task_user_regset_view(child);
 703         compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
 704         struct pt_regs32 __user *pregs;
 705         struct compat_fps __user *fps;
 706         unsigned long addr2 = caddr2;
 707         unsigned long addr = caddr;
 708         unsigned long data = cdata;
 709         int ret;
 710
 711         pregs = (struct pt_regs32 __user *) addr;
 712         fps = (struct compat_fps __user *) addr;
 713
 714         switch (request) {
 715         case PTRACE_PEEKUSR:
 716                 ret = (addr != 0) ? -EIO : 0;
 717                 break;
 718
 719         case PTRACE_GETREGS:
 720                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 721                                           32 * sizeof(u32),
 722                                           4 * sizeof(u32),
 723                                           &pregs->psr);
 724                 if (!ret)
 725                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 726                                                   1 * sizeof(u32),
 727                                                   15 * sizeof(u32),
 728                                                   &pregs->u_regs[0]);
 729                 break;
 730
 731         case PTRACE_SETREGS:
 732                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 733                                             32 * sizeof(u32),
 734                                             4 * sizeof(u32),
 735                                             &pregs->psr);
 736                 if (!ret)
 737                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 738                                                     1 * sizeof(u32),
 739                                                     15 * sizeof(u32),
 740                                                     &pregs->u_regs[0]);
 741                 break;
 742
 743         case PTRACE_GETFPREGS:
 744                 ret = copy_regset_to_user(child, view, REGSET_FP,
 745                                           0 * sizeof(u32),
 746                                           32 * sizeof(u32),
 747                                           &fps->regs[0]);
 748                 if (!ret)
 749                         ret = copy_regset_to_user(child, view, REGSET_FP,
 750                                                   33 * sizeof(u32),
 751                                                   1 * sizeof(u32),
 752                                                   &fps->fsr);
 753                 if (!ret) {
 754                         if (__put_user(0, &fps->flags) ||
 755                             __put_user(0, &fps->extra) ||
 756                             __put_user(0, &fps->fpqd) ||
 757                             clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
 758                                 ret = -EFAULT;
 759                 }
 760                 break;
 761
 762         case PTRACE_SETFPREGS:
 763                 ret = copy_regset_from_user(child, view, REGSET_FP,
 764                                             0 * sizeof(u32),
 765                                             32 * sizeof(u32),
 766                                             &fps->regs[0]);
 767                 if (!ret)
 768                         ret = copy_regset_from_user(child, view, REGSET_FP,
 769                                                     33 * sizeof(u32),
 770                                                     1 * sizeof(u32),
 771                                                     &fps->fsr);
 772                 break;
 773
 774         case PTRACE_READTEXT:
 775         case PTRACE_READDATA:
 776                 ret = ptrace_readdata(child, addr,
 777                                       (char __user *)addr2, data);
 778                 if (ret == data)
 779                         ret = 0;
 780                 else if (ret >= 0)
 781                         ret = -EIO;
 782                 break;
 783
 784         case PTRACE_WRITETEXT:
 785         case PTRACE_WRITEDATA:
 786                 ret = ptrace_writedata(child, (char __user *) addr2,
 787                                        addr, data);
 788                 if (ret == data)
 789                         ret = 0;
 790                 else if (ret >= 0)
 791                         ret = -EIO;
 792                 break;
 793
 794         default:
 795                 ret = compat_ptrace_request(child, request, addr, data);
 796                 break;
 797         }
 798
 799         return ret;
 800 }
 801
 802 struct fps {
 803         unsigned int regs[64];
 804         unsigned long fsr;
 805 };
 806
 807 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 808 {
 809         const struct user_regset_view *view = task_user_regset_view(child);
 810         struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 811         unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
 812         struct fps __user *fps = (struct fps __user *) addr;
 813         int ret;
 814
 815         switch (request) {
 816         case PTRACE_PEEKUSR:
 817                 ret = (addr != 0) ? -EIO : 0;
 818                 break;
 819
 820         case PTRACE_GETREGS64:
 821                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 822                                           1 * sizeof(u64),
 823                                           15 * sizeof(u64),
 824                                           &pregs->u_regs[0]);
 825                 if (!ret) {
 826                         /* XXX doesn't handle 'y' register correctly XXX */
 827                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 828                                                   32 * sizeof(u64),
 829                                                   4 * sizeof(u64),
 830                                                   &pregs->tstate);
 831                 }
 832                 break;
 833
 834         case PTRACE_SETREGS64:
 835                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 836                                             1 * sizeof(u64),
 837                                             15 * sizeof(u64),
 838                                             &pregs->u_regs[0]);
 839                 if (!ret) {
 840                         /* XXX doesn't handle 'y' register correctly XXX */
 841                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 842                                                     32 * sizeof(u64),
 843                                                     4 * sizeof(u64),
 844                                                     &pregs->tstate);
 845                 }
 846                 break;
 847
 848         case PTRACE_GETFPREGS64:
 849                 ret = copy_regset_to_user(child, view, REGSET_FP,
 850                                           0 * sizeof(u64),
 851                                           33 * sizeof(u64),
 852                                           fps);
 853                 break;
 854
 855         case PTRACE_SETFPREGS64:
 856                 ret = copy_regset_to_user(child, view, REGSET_FP,
 857                                           0 * sizeof(u64),
 858                                           33 * sizeof(u64),
 859                                           fps);
 860                 break;
 861
 862         case PTRACE_READTEXT:
 863         case PTRACE_READDATA:
 864                 ret = ptrace_readdata(child, addr,
 865                                       (char __user *)addr2, data);
 866                 if (ret == data)
 867                         ret = 0;
 868                 else if (ret >= 0)
 869                         ret = -EIO;
 870                 break;
 871
 872         case PTRACE_WRITETEXT:
 873         case PTRACE_WRITEDATA:
 874                 ret = ptrace_writedata(child, (char __user *) addr2,
 875                                        addr, data);
 876                 if (ret == data)
 877                         ret = 0;
 878                 else if (ret >= 0)
 879                         ret = -EIO;
 880                 break;
 881
 882         default:
 883                 ret = ptrace_request(child, request, addr, data);
 884                 break;
 885         }
 886
 887         return ret;
 888 }
 889
 890 asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
 891 {
 892         /* do the secure computing check first */
 893         secure_computing(regs->u_regs[UREG_G1]);
 894
 895         if (unlikely(current->audit_context) && syscall_exit_p) {
 896                 unsigned long tstate = regs->tstate;
 897                 int result = AUDITSC_SUCCESS;
 898
 899                 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
 900                         result = AUDITSC_FAILURE;
 901
 902                 audit_syscall_exit(result, regs->u_regs[UREG_I0]);
 903         }
 904
 905         if (!(current->ptrace & PT_PTRACED))
 906                 goto out;
 907
 908         if (!test_thread_flag(TIF_SYSCALL_TRACE))
 909                 goto out;
 910
 911         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 912                                  ? 0x80 : 0));
 913
 914         /*
 915          * this isn't the same as continuing with a signal, but it will do
 916          * for normal use.  strace only continues with a signal if the
 917          * stopping signal is not SIGTRAP.  -brl
 918          */
 919         if (current->exit_code) {
 920                 send_sig(current->exit_code, current, 1);
 921                 current->exit_code = 0;
 922         }
 923
 924 out:
 925         if (unlikely(current->audit_context) && !syscall_exit_p)
 926                 audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
 927                                      AUDIT_ARCH_SPARC :
 928                                      AUDIT_ARCH_SPARC64),
 929                                     regs->u_regs[UREG_G1],
 930                                     regs->u_regs[UREG_I0],
 931                                     regs->u_regs[UREG_I1],
 932                                     regs->u_regs[UREG_I2],
 933                                     regs->u_regs[UREG_I3]);
 934 }